Rampage Through Time is the fourth game in the Rampage series, released in 2000. Its predecessor is Rampage 2: Universal Tour, and it is followed by Rampage: Total Destruction. In the game, seven previous Scumlabs monsters and one new one use a time machine to rampage through time.

Rampage World Tour is a video game released in 1997 and is the second game in the Rampage series. The game was developed as an arcade game for Midway Games by Game Refuge Inc. designers Brian Colin and Jeff Nauman, who conceived and designed the original in 1986. It was ported to the Sega Saturn, Nintendo 64, Game Boy Color, PlayStation, Microsoft Windows and has been re-released on Midway Arcade Treasures 2 as well as being included in Rampage: Total Destruction.

RayCrisis, known as RayCrisis: Series Termination in North America, is the third game released in the "Ray" series of Taito shooting games. Chronologically, it is considered a prequel to the first game, RayForce. First released for arcades in 1998, it supported co-op mode for two players, which the PlayStation ports released in 2000 lack; these ports are the only games in the "Ray" series to lack co-op.

RayStorm is a scrolling shooter developed by the Taito Corporation. Originally released in Japan as an arcade game in 1996, it was later ported there to Sony's PlayStation game console in 1997, to the Sega Saturn (under the name Layer Section II) in that same year, and to Windows-based personal computers in 2001. In North America, it was released for the PlayStation by Working Designs in June 1997. The PlayStation version was also released in Europe by SCE Europe. It was re-released in 2010 with improved graphics, as RayStorm HD, for the Xbox 360 and the PlayStation 3 (with the latter version released exclusively in Japan). In 2012, RayStorm was also released for iOS.The game is set hundreds of years in the future. Players must pilot their "R-Gray" spacecraft through eight vertically scrolling stages and shoot down enemy ships and vehicles to prevent the forces of the Secilia Federation, a rebellious group of colonies, from destroying Earth. The arcade versions let each player choose one of two ships; home ports include additional ships and features.RayStorm is one of three "Ray" games, all featuring similar gameplay, released by Taito. RayForce was released before RayStorm, and the RayForce prequel RayCrisis was released after the others. RayStorm is most distinguished from its predecessor by its usage of polygon-based ships instead of sprites. The plot of RayStorm, which is minimally revealed in the game itself but further described by the game's instruction manual and "Extra Mode" in home releases, is not connected to the "Con-Human" storyline of the other two games. Its PlayStation versions were generally well received by American reviewers, but criticized for short game length and similarities to other games such as Xevious 3D/G+.

Re-Loaded is a science fiction-themed top-down shoot 'em up video game that was developed by Gremlin Interactive and published by Interplay. A sequel to Loaded, it was released in 1996 for the PlayStation and MS-DOS, and later on PlayStation Network.The game received negative reviews from critics, calling it a poor sequel.